-10
Only one.
1 and 400.
4
16 => 256 17 => 289 18 => 324 19 => 361 20 => 400
Fifteen of them. All but numbers of the form 4n-2 = 2, 6, 10, 14, 18
28 is a perfect number.
There are 8 perfect squares TTThe
Three numbers.
30
The perfect squares that are less than 20 are 0, 1, 4, 9, and 16.
The first 6 perfect squares are 1,4,9,16,25, and 36, When you are doing perfect squares, you multiply by itself. Thank you Mrs.Pelfrey By: Camila
Only one - 16
20 squares x 20 squares = 400 squares
1 and 400.
The only perfect number between 20 and 50 is 28.
three ==================== There are an infinite number of them. Here are a few: (2.01)2 = 4.0401 (2.02)2 = 4.0804 (2.021)2 = 4.044121 (2.02101)2 = 4.08448142
4
400 and 900 are squares of 20 and 30, respectively.